tree dde34cc84ebafab91d5a3ffce4bfebab3cf2e556
parent e1b59459da97f26e80e3fa6ab0e15ea2dc447b88
author Eric Dumazet <edumazet@google.com> 1339242955 +0200
committer Stephen Hemminger <shemminger@vyatta.com> 1339451723 -0700

ip: speedup ip link

ip link has quadratic behavior because store_nlmsg()
has a head list pointer and search the end of list.

Provides a head/tail to cut time.

Time with 128000 net devices, to do "ip link show dev xxx"

Before: 2m3.594s
After: 0m2.830s

Signed-off-by: Eric Dumazet <edumazet@google.com>